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300-415 · Question #277

Which behavior describes a WAN Edge router running dual DIA when its DPI engine has identified a cloud SaaS application?

The correct answer is D. Application traffic flows are routed over best performing DIA circuit, which makes the routing decision based on the best performing path. When a WAN Edge router running dual DIA identifies a cloud SaaS application via DPI, it routes the application traffic over the DIA circuit currently exhibiting the best performance.

WAN Edge Router Deployment

Question

Which behavior describes a WAN Edge router running dual DIA when its DPI engine has identified a cloud SaaS application?

Options

  • AThe gateway WAN Edge router DPI engine accepts the DNS query for SaaS applications, and DNS queries for noncloud applications follow the explicit path.
  • BThe WAN Edge DPI engine never selects a subperforming DIA circuit for the first application, and the WAN Edge router finds the SaaS application.
  • CExisting flows change the path and drop the traffic when the performance of the chosen path degrades.
  • DApplication traffic flows are routed over best performing DIA circuit, which makes the routing decision based on the best performing path.

How the community answered

(58 responses)
  • A
    2% (1)
  • B
    3% (2)
  • C
    5% (3)
  • D
    90% (52)

Why each option

When a WAN Edge router running dual DIA identifies a cloud SaaS application via DPI, it routes the application traffic over the DIA circuit currently exhibiting the best performance.

AThe gateway WAN Edge router DPI engine accepts the DNS query for SaaS applications, and DNS queries for noncloud applications follow the explicit path.

The DPI engine identifies applications, but the description of how DNS queries are handled for SaaS versus non-cloud applications is not the primary behavior of traffic routing based on performance for identified SaaS apps.

BThe WAN Edge DPI engine never selects a subperforming DIA circuit for the first application, and the WAN Edge router finds the SaaS application.

"The WAN Edge DPI engine never selects a subperforming DIA circuit for the first application" is too absolute and does not fully capture the dynamic, real-time nature of selecting the best performing path.

CExisting flows change the path and drop the traffic when the performance of the chosen path degrades.

Existing flows changing the path is correct, but dropping traffic when performance degrades is an undesirable outcome; the goal is to move to a better path without significant traffic interruption.

DApplication traffic flows are routed over best performing DIA circuit, which makes the routing decision based on the best performing path.Correct

Cisco SD-WAN's DPI engine identifies cloud SaaS applications and, when configured with dual DIA, uses Application-Aware Routing (AAR) to direct traffic over the best performing DIA circuit. This decision is continuously made based on real-time performance metrics (like latency, loss, and jitter) to ensure optimal user experience for critical applications.

Concept tested: SD-WAN DPI and Application-Aware Routing (AAR) with DIA

Source: https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/sdwan-xe-gs-cr-book/application-aware-routing.html

Topics

#WAN Edge Router#DPI#SaaS Optimization#Application-aware routing

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